Static condenser



April 13 1926.

J. J. WELDON STATIC CONDENSER Filed June 7, 1924 Invntor John J WeLclon H Ls Attor-nqy Patented Apr. 13, 1926.

UNITED STATES PATENT OFFICE.

JOHN J'. WIELDON, 0F PITTSFIELD, MASSACHUSETTS, ASSIGNOB TO GENERALVELEC- TRIO COMPANY, A CORPORATION OF NEW YORK.

STATIC CONDENSER.

Application led June 7, 1924. Serial No. 718,645.

To all whom t may concern Be it known that I, JOHN J. WELDON, a

of Massachusetts, have invented certain new and useful Improvements in Static Condensers, of which thefollowing is a specification. My invention relates to the construction of static condensers of the typeused for power factor correction.

One object of my invention is to provide a static condenser having improved means for dissipating the heat which is generated therein. Another object is to provide a condenser comprising a plurality of separate units having improved means for supporting the units and for making electrical connections thereto. A further object is the provision of improved means for securing the units together to form a group.

My invention will be better lunderstoo from the following description taken in connection with the accompanying drawing, and its scope will be pointed out in the appended claims. j

Referring to the drawing, Fig. 1 shows an elevation partlyl in section of a single unit of a condenser constructed according to my invention together with portions connected therewith; Fi 2 is an elevation drawn to a smallersca e of several connected units; Fig. 3 is an' end view of one of the condenser rolls after an end late has been applied thereto and remove Fig. 4 is a perspective view of an end plate; and Fig. 5 is a fragmentary cross-sectional view of a conldenser roll drawn to a greatly magnified sca e.

According to my invention a complete condenser comprises a plurality of units, four inthe present instance, each com rising a cylindrical roll of metal foil an dielectric and all connected together mechanically and electrically to form a group which f is immersed in a tank containing an insulating liquid. The three units 1, 2 and 3, shown in Fig. 2, are identical in construction, unit 1 being illustrated on a larger scale and in greater detail in Fig. 1.. Each unit roll is formed by winding on Va tube 4 of insulation two strips 5 and 6 of metal foil, for example, alummum, separated from each other by a suitable dielectric, for example, paper subsequently impregnated With a suitable insulating liquid. Good results have been obtained b using for the strips 5 and 6 aluminum foi having a thickness of one halfl mil and separating the strips by eight layers of a high grade linen paper eachhaving mil, the unit being afterward treated in a vacuum tank where the paper is thoroughly impregnated with an insulating oil, as for example transil oil. The unit 1s wound in such `a manner that an edge portion of one strip of foil projects slightly beyond the dielectric at one end of the roll and an edge portion of the other strip of foil projects slightly beyond the dielectric at the opposite end of the roll. This is clearly illustrated in Fig. 5 where for convenience the foils and layers of paper are shown enlarged many times their natural size. It will be seen also from this ligure that the edge of each foil opposite to that which projects beyond the dielectric does not uite reach the corresponding edge of the die ectric.

Each unit rests upon a contact disk 8 which as more clearly shown in Fig. 4 haspon its upper face four radially extending ribs 9 and a central threaded aperture l0. When the unit roll is laced upon this disk with the insulation tube 4 projecting between the inner ends of the ribs 9 the projecting foil edges are bentover or crushed where they are engaged by the ribs until stopped by the edges of the dielectric. Fig. 3 illustrates how the end of the roll appears after the a thickness of one half plate 8 has been pressed against the roll and removed. The projectingiedge of foil 6 bends inwardly as shown at 11 wherever l it is engaged'by a rib 9. Those portions of the foil edges between the ribs 9 are not disturbed and since the height of the ribs is materially greater than the height of the foil projections a free space 12 1s left between each two adjacent ribs for -the insulating liquid to circulate in contact with the projecting foil edges. Heat generated within the condenser unit thus may be conveyed to the exterior thereof where it is given up loo Y to the insulating liquid which in circulating l carriesvit away t'o cooler portions of the apparatus. The disk 8 .rests upon a block 13 of insulating material, which for example may be porcelain, and is shown provided with a central projection 14 which fits into a correspondin depression in the insulatblock. Eac block 13 is shown in Fig.

in 2, thaving suilicient length to carry two units l1l lAbove the units a similar construction is used but diering tom that just described chiefly in that it comprises a single contact member 16 adapted to engage all oit the units. rllhis member preferably has the form. of a plurality ot disks, four in the present case, there being one for each unit, like disk 8, which are integrally joined together at their adjacent portions. The ribs 17 on the member 16 engage the projecting edges of toil 5 to make contact therewith and to provide a space for the insulating liquid to circulate in contact with the projecting toil just as has been described above in con-- nection with the disks`8. Resting upon the member 16 and separated therefrom by a gasket 18 is the block of insulating material 19, such as porcelain, which may have a length sufficient to cover two units as illustrated for example by Fig. '2. A metal rod 20 is screw-threaded into the central aperture of each of the disks 8 and passing up through the center ot the unit extends through suitable openings in the members 16 and 19. A conductor 21 connects together the units in pairs, as for example units 1 and 2, and, together with a terminal 22, is shown secured to the rod 20 between a nut 2t threaded thereon and a spring washer 25. Additional tie bplts are shown also at 26 for securing the blocks 13 and 19 together.

The circuit connections of the unit-s will be obvious from the drawing for since the conductor 21 connects the terminal 22 to both rods 20 of units 1 and 2 and since the member 16 is common to units 1 and 2 these two unitsaccording to the structural arrangement illustrated are connected in the circuit in parallel. Likewise the other two units, one onl of which is illustrated, will be connected 1n parallel. By means of the member 16 the two pairs of units will be connected to each other in series. 1t will be headers noted that as the contact member 16 is 41 clamped to each ot' the condenser units it serves to unite them all in a group thereby facilitating the'handling ot the units without changing their relative positions or their connections one with another.

lWhile l have described only one embodiment of my invention, l do not wish to be limited to the particular form shown and described as it will be apparent that many modifications therein may be made without departing from the scope ot' my invention as set forth in the appended claims.

lWhat l claim as new and desire to secure by Letters Patent of the United States, 1s:-

1. A condenser comprising a roll formed of a plurality of metal 'foils and layers ot dielectric and immersed in insulating liquid, said foils having edges exposed to said liquid at opposite ends of said roll, and means comprising radially extending members for making contact with portions of said edges.

2. A condenser, comprising a tank containing insulating liquid, a condenser roll having a metal foil projecting at each end thereof and adapted to conduct heat yfrom the interior of said roll to said liquid, and supporting means for said rolls comprising members having engaging portions extend# ing substantially radially ot said rolls.

3. A. condenser comprising a tank containg insulating liquid, a condenser roll comprising a pair of metal foils and a dielectric therebetween, each ot said foils having an edge portion extending beyond" the edge of the dielectric at opposite ends of said roll, a plate at each end ot' said roll having ribs thereon extending substantially radially thereoand means for clamping said plates against said roll.

lln witness whereof, l have hereunto set my hand this 5th dal of J une 1924.

HN d. WELlDON, 

